I also stumbled across a nice video on Youtube of a cloisonne enameling factory in Beijing which shows the whole process quite nicely.

Then there is thecloisonne page on wikipedia of course, which also has some nice examples of antique cloisonne. The Art of Cloisonné details the process of making cloisonne step by step along with some detailed photos of the process and the artisans.

Related Books & Reading

CloisonneCloisonne introduces the content such as the history, technology, models and decorative designs of cloisonne.